. >>> reporter: 62-year-old stephen brooks has battled prostate cancer twice. the first time he was treated with radiation. but when it recurred, brooks got into a clinical trial using a new treatment. >> how are your psa numbers? >> 0.1, cancer-free. >> reporter: brooks credits his lower psa, the number used to indicate the presence of any prostate cancer, to high intensity focused ultrasound treatment. >> it's more accurate in terms of delivering energy to a specific area without damaging the surrounding areas. >> reporter: because it doesn't harm the rest of th prostate, it has less side effects than surgery and radiation. >> incontinence? >> no incons tense. >> reporter: the clinical trials offer patients whose prostate cancer has come back but if it gets fda approval, the technique could also be used for patients diagnosed for the first time. he wants to be an example for other african-american men. since they are more likely than white men to develop prostate cancer and twice as likely to die from it. >> if you don't take these tests, what chance do you h